Cylinder and jacket construction for engines



Sept. 22, 1942. c. L. STRAUB 2,296,748

CYLINDER AND JACKET CONSTRUCTION' FOR ENGINES Original Filed March 24, 1939 2 Sheets-Sheet l INVENTOR GOA/JZ'fiNW/Vf/ff 579605.

BYW w ATTORNEY.

Sept. 22, 1942 c. L. STRAUB 2,296,748

CYLINDER AND JACKET CONSTRUCTION FOR ENGINES Original Filed March 24, 1939 2 Sheets-Sheet 2 Mn o 1 %7 a W I I I :l I I H l 1 T i I I a I; 4 W W m 24 1 A I 1 l Z3 mm MH, III 6 m H L INVENTOR 2Z0 E /g 2 CONSm /Vr/MF Zif 5777606 w MAL AT TO RN EY.

Patented Sept. 22, 1942 CYLINDER AND JACKET CONSTRUCTION FOR ENGINES Constantine Lee Straub, Milwaukee, Wis., assignor to Robert W. Baird, Milwaukee, Wis.

Original application March 24, 1939, Serial No. 263,885. Divided and this application April 16, 1941, Serial No. 388,808

3 Claims.

This invention relates generally .to oil burning engines, and more particularly to the cylinder and jacket constructions employed in such engines, and while of notable utility when employed in two stroke cycle fuel injection, compression ignition engines, it will be understood that I contemplat the utilization of my improvements in any field in which they are adapted by their nature.

The present application is a division of my application for Fuel injection, compression ignition oil engine, Serial No. 263,885, filed March 24, 1939.

In carrying out the present invention, the engine has embodied therein a cylinder and jacket construction so constituted and so organized as to provide exhaust and inlet ports of such height and area as to afford the time and volumetric efficiency required for the efficient displacement of both exhaust and inlet gases at the designed speeds of rotation. It will be evident that ports of such maximum areas will of necessity almost circumscribe the cylinder periphery and thereby afiect the structural strength of the cylinder wall.

Such gas ports require bridges, or bars of metal,

integral with the cylinder Walls to prevent the expansion of the piston rings into the port openings. I have found that such bridges, if made of sufiicient depth, and if extended deeply through the gas passageways, and also if extended into the water jacket areas surrounding the cylinder above and below the port levels and formed integral with both the cylinder and water jacket barrels, and with proper provision supplied therewith for the circulation of cooling water, provide not only ample longitudinal and lateral strength to sustain the high stresses of Diesel cycle operation, but also act as cooling fins to convect the otherwise destructively high temperatures away from the port bridges and into the surrounding water jacket.

Other objects and advantages reside in certain novel features of the construction, arrangement, and combination of parts, which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming a part of this specification, and in which:

Figure l of these drawings illustrates a pair of cylinders with their respective pistons, connecting rods, and crank pin on a common plane;

Figure 2 shows an enlarged sectional elevation of a portion of one of such cylinders; and

Figure 3 shows horizontal sections through such a cylinder.

Referring to the drawings it will be seen that in the embodiment of the invention shown the cylinder and jacket construction is incorporated in a fuel injection, compression ignition type of oil engine having a crank case 5 supporting the cylinders, designated generally at 6. In each cylinder 6 a piston I is fitted for reciprocation and acts through a connecting rod 8 to rotate a crank shaft, designated at 9. Such features as the air compressor or blower IO, rotary valve H, and compression release valve l2 per se form no part of the present invention and hence will not be described in detail, reference being made, however, to myparent application Serial No. 263,885 for a complete and detailed disclosure of these parts.

The cylinders 6 are of identical construction and preferably are castings. Each cylinder 6 has an inner cylinder wall I5 of normal or substantial dimensions surrounded by a water jacket l6 integrally connected at its ends with the cylinder wall 15 by means of webs l8 and I9. In the space 20 between the cylinder wall l5 and jacket iii of each cylinder the cooling water is circulated. Each cylinder 6 is also formed with an inlet port 2| and an outlet or exhaust port 22.

As shown in the lower half of Figure 3, and,

of course, the structure of the cylinder in the upper half of the same plane of Figure 3 is identical, the inlet and outlet ports are of such substantial area as to almost circumscribe the periphery of their cylinder 6, which would ordinarily tend to impair the structural strength of the cylinder wall. The present invention proposes, however, to combine with these ports special type of bridges, those on the inlet port being designated at 23, and those on the outlet port being designated at 24. The bridges 23 and 24 are both, however, of substantial depth and not only extend across and bridge the ports but also have integral extensions 26 and 21, respectively, formed integral with the cylinder wall I5 and extending above and below their port level for the full length of the cylinder wall 15. The extensions 26 and 21 of the bridges may be tapered, as shown to advantage in Figures 1 and 2, to make provision for the proper circulation of the cooling water. When constructed in this manner, the bridges amply strengthen and reinforce the cylinder wall structure so much as to impart to it the longitudinal and lateral strength to sustain the high stresses of Diesel cycle operation. Furthermore, they act as cooling fins to convect the otherwise destructively high temperatures away from the port bridges proper and into the surrounding water jacket.

The heat absorbed by the bridges of both inlet and exhaust ports is largely convected into the cooling water surrounding the cylinder Wall by the extended ribs or bridge sections above and below the levels of the inlet and exhaust ports, and these extended ribs or bridges also serve to restore to the cylinder wall itself some of the structural strength which is removed by the exhaust and inlet port apertures biseoting the cylinder walls. Practice has shown that this construction provides safe and permanent port bridges.

While I have shown and described one construction in which the invention maybe advantageously embodied, it is to be understood that the construction shown has been selected merely for the purpose of illustration or example, and that various changes in the size, shape, and arrangement of the parts may be made without departing from the spirit of the invention or the scope of the subjoined claims.

I claim:

1. The combination of a water jacketed cylinder having a piston reciprocating therein and having ports perforating said cylinder walls for the admission and exhaust of gases, port bridges integral with the cylinder walls and extending across the ports thereof, said part bridges being of substantial depth and also having extensions extending lengthwise of the cylinder and disposed in the water passageway provided between the outside of the cylinder wall and its jacket to reinforce and strengthen the cylinder wall and to provide water-cooled heat dissipating fins for said bridges.

2. The combination of a water jacketed cylinder having a piston reciprocating therein and having ports perforating said cylinder walls for the admission and exhaust of gases, port bridges integral with the cylinder walls and extending across the ports thereof, said port bridges being of substantial depth and also having extensions extending lengthwis of the cylinder and disposed in the water passageway provided between the outside of the cylinder wall and its jacket to reinforce and strengthen the cylinder wall and to provide water-cooled heat dissipating fins for said bridges, said extensions of said bridges being tapered to provide for circulation of the water through said passageways.

3. The combination of a water jacketed cylinder having a piston reciprocating therein and having ports perforating said cylinder walls for the admission and exhaust of gases, port bridges integral with the cylinder Wall and extending across the ports thereof, said port bridges being of substantial depth and also having extensions extending lengthwise of the cylinder and disposed in the Water passageway provided between the outside of the cylinder wall and its jacket, said extensions being continued from their juncture with the bridges proper to the ends of the water space between the cylinder wall and its jacket to reinforce and strengthen the cylinder wall and to provide water-cooled heat dissipating fins for said bridges.

CONSTANTINE LEE STRAUB. 

